Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Non-cash asset impairments	$ 570	$ 13	$ 58
Layoff costs	103	20	64
Pension and Other postretirement benefits - net settlement and curtailment charges	(49)	91	0
Net (gain) loss on divestitures of assets and businesses (S)	(20)	(109)	57
Other	26	13	(3)
Reversals of previously recorded layoff costs	(10)	(19)	(11)
Restructuring and other charges	$ 620	$ 9	$ 165